Reamer for thread-cutters.



A. L. MAXWELL.

REAMER FOR THREAD GUTTERS.

APPLICATION FILED DEO.17, 100s.

' 926,272, Patented June 29, 1909.

ALEXANDER L. MAXWELL, OF DETROIT, MICHIGAN.

REAMER FOR THRE AD-OUTTERS.

Specification of Letters Patent.

Patented June 29, 1909.

Application filed December 17, 1908. Serial No. 468,054.

To all whom it may concern:

Be it known that I, ALEXANDER L. hIAX- WELL, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a new and useful Iniprovement in Reameis for Thread-Cutters, of which the following is a specification.

The present invention relates to a reaming attachment for pipe thread cutters, by which burs and ragged edges may be removed from the interior of the pi e at its ends at the same time that the t read is beingcut. There have been such devices roposed heretofore, but in all of them, so

ar as I am aware, there has been a multiplicity of parts, such as to render the cost of production excessive and to require much manipulation and adjustment in their use.

To overcome these objections, I have provided a device which is extremely sim le in construction and which may be readi y adjusted forservice or swung out of the way, without detachment from the cutter, when not in use.

The specific character of the invention will be'best understood upon reference to the following description taken in connection with the accompanying drawing, and the scope of the invention wil be pointed out in the appended claims.

' In the drawing, Figure 1 is a perspective view of the reaming attachment; Fig. 2 is a plan viewof a pipe thread-cutter with the reamer in osition thereon; and Fig. 3 is a side elevation of the same with parts broken I away.

In these figures, corres )onding parts are designated by the same 0 aracters.

As willbe seen from an inspection of Fig. 1, the reamer, which may be designated generally A, is composed of a single piece of metal, preferably steel, bent so as to bring its opposite ends at substantially right angles to each other'and having the one slotted for attachment to the die stock, and the other shaped and tempered so asv to provide cuttin edges for removing the burs and ragge edges from the interior of the pipe. The cuttin end of the reamer is prefera ly shaped wit pyramidal faces 11 and intervening cutting edges 12. As here shown, four such faces are provided and this arrangement is particularly advantageous when it is desired to sharpen the rearner, since each face may be pressed against an emery-wheel or grindstone and the required "sharpness of the edges obtained. This arrangement is of distinct advantage, since such grinding implements are more readily available than those necessary to sharpenmore complicated cutters. The attaching end 13 of the reamer is provided with a relatively large flat bearing surface which gives stability to the device when in position on the thread-cutter. The slot 14 is provided for the passage of the attaching bolt and permits the reainer to be centered upon the cutter.

In Figs. 2 and 3, a thread-cutter B of a well-known type is illustrated. It comprises the die stock 15 with the usual handle 16 and dies 17, 18, together with the bracket 19 and collar 20 for the guidance of the pipe such as 21, upon which the thread is to be cut. The

collar 20, which is selected according to the size of pipe to be operated upon, is held in the bracket 19 of the die stock by a suitable thumb-screw 22. The dies 17, 18 are provided with slots, shown by dotted lines in Fig. 2, through which suitable bolts 23, 24 pass into threaded engagement with the die stock. They are suitably adjusted before screwing the'bolts 23, 2.4 home, b T adjusting screws 25, 26, passing through ugs 27, 28 upon the stock.

As here illustrated, the reamer A is attached by the bolt 23 which passes through the die 17. As they die stocks are purchased in the market, the (lie 17 is secured in place by a bolt of the same length as the bolt 24; and in order to provide for attaching the reamer, it is only necessary to provide a somewhat longer bolt. The position of the reamer may be adjusted toward and from the die stock by washers 01' nuts placed between the end 13 and the adjacent die, thereby adapting it for pipes of different diameters. In the present instance, a single washer 29 is shown in position at this point, but obviously other washers or nuts might be provided to give this adjustment. The reamer may be readily adjusted with reference to the center of the pipe by reason of the slot 14.

In the operation of the device, as is well known, the cutter and reamer occupy the position upon the pipe illustrated in Fig. 3; and as the handles are grasped by the operator and the whole is rotated, the thread is out and the end of the pipe reamed out. When it isdesired to use the cutter without the i reamer, the latter may be swung out of the way by simply loosening the bolt 23, rotating the reamer to, say, the dotted line position, and then tightening up the bolt 23 again.

It will be seen from the above that the roaming attachment I have produced is small and of relatively simple construction and may be put into position for service, adjusted, or sharpened with a minimum of labor and with devices readily available to workers in this art. The die stock here illustrated is that known to the trade as the Armstrong die stock, but the attachment is obviously applicable to other stocks of similar construction.

What I claim as new and desire to secure by Letters Patent of the United States is 1. A reaming attachment for pi e threadcutters comprising a single mem er terminating at one end inpyramidal faces having cutting edges and at the other end in a flat slotted portion extending substantially at right angles to the axis of the pyramid formed by said faces.

enter the end of a pipe passing between the dies of a cutter and provided with suitable cutting edges for removing burs from the interior of the pipe, and having a fiat slotted end extending substantially at right angles to the free end and adapted to lie substantially parallel to'one of said dies, a bolt for connecting the attachment and adjacent die to the die stock, and means for adjusting said attachment toward and from said die stock.

In witness whereof, I hereunto subscribe my name this 11th day of December, 1908.

ALEXANDER L. MAXWELL. Witnesses:

RICHARD I. LAWSON, CLARENCE D. DWYER. 

